Visual Astronomy of the Night Sky

R. N. Clark

These pages are dedicated to Visual Astronomy of the Night Sky. Many of the concepts
discussed here follow from my book Visual Astronomy of the Deep Sky.
In these pages, I present info on astronomical observing and clarifications
of concepts in the book. The Deep Sky generally refers to beyond the solar system.
By using the term Night Sky, I will include solar system observations too.

The Optimum Magnified Visual Angle (OMVA),
for detecting the smallest,
lowest contrast objects or detail within objects viewed through a telescope.
Recent research and discussion about the concept, the confusion and controversies
concerning the OMVA.